Soldering iron



Feb. 9 1926. Y J. E. MARSDEN SOLDERING IRON Filed Feb. 11. 192s RNEYPatented Feb. 9, 1926.

UNiTED STATES 1,572,666 PATENT ort-fica.

JOI-IN E. MARSDN, OF PHILADELPHIA, PENNSYLVANIA.

soLnnRINe- IRON.

Application filed February T0 @ZZ t/ilzomt may concern Be it known thatl, JOHN Fi. MARsDnN, a

'citizen of the United States, residing at Philadelphia, in the countyof Philadelphia and State of Pennsylvania, have invented certain new anduseful In'iproveinents in Soldering Irons, of which the following is aspecification.

This invention relates to metal working tools and has particularreference to solder ing irons.

Among` the objects of this invention is to provide a soldering iron witha self-con tained heating unit adjacent to the point tliei'eof and onethat is peculiarly constructed for electric heating purposes.

More specifically, one of my'primary objectsv of the present inventionis to provide a soldering iron with a self-contained electric resistancecoil for heating the point of the iron and with a peculiarly novelhandle structure so arranged as to accommodate the electric wires and toinsure that the handle will be kept sufliciently cool .for the comfortof the operators hand.

lilith the foregoing and other objects in view the invention consists inthe arrangement and combination of parts hereinafter described andclaimed, and while the iiivention is not restricted to the exact detailsof construction disclosed or suggested herein, still for the purpose ofillustrating a practical embodiment thereof reference is had to theaccompanying drawings in which like reference characters designate thesame parts in the several views, and in which- Figure l is a perspectivediagram showing one form of my device complete.

Fig. 2 is an enlarged longitudinal section of the tool.

Fig. 3 is a transverse sectional detail on the line 3*?) of Fig. 2.

Fig. L is a detail perspective of the bushing or sleeve.

Fig. 5 is a fragmentary detail of the point port-ion of a modification.

Referring now more specifically to the drawings, I show a soldering ironcomprising a tubular shank 10 of metal or the like and adapted to carrywithin it a resistance coil or heating` unit 1l, the coil being sofitted in the shank as to project somewhat, say a half inch or so,beyond the end of the shank.

The point portion l2 of the tool, made of copper or its equivalent, isfitted upon the 11, 1925. Serial No. 8,361.

outer end of the shank and secured thereto in any suitable manner eitherfrictionally or otherwise, as shown in Figs. l and 2, or as shown inFig. the point l2 may be fitted within the expanded end l0 of the shank.in either case the hollow point member and the outer end of thc shankare telescoped in attached position. The projected end of the coil ll isnested within the hollow interior of the point at ll in bothmodifications.

13 indicates a haiidle through the bore l5 of which the wires la fromthe heating unit l1 extend and lead to any suitable source of energy. Atthe base of the handle a wedge 16 may be driven to snub or hold theadjacent portion of the wire iii liXed position, but a slight air spacemay be left between the wire and the handle and alongside the wedge.

The neck portion of the handle is reinforced with a ferrule 17, andvthis part of the handle is counter bored somewhat larger than the shankl() fitted thereinto, and between the shank and the body of the handlewhere so reinforced is driven a bushing or sleeve 1S made by crimping orfluting a strip of metal of uniform thickness of stock. This bushing maybe made of brass or any other suitable metal of low heat conductivity.The iiuting as indicated provides for a certain amount of resiliencyincident to the fitting of the shank into the handle, but nioreparticularly, it provides longitudinal parallel air spaces along thegrooves both inside an-d outside of the bushing, one series of spacesbeing' next to the reinforced end of the handle, and the other seriesbeing along the shank. rlhe inner or rear end of the bushing lies spacedslightly forward from a series of radial holes 19 bored directly throughthe handle, whereby a free circulation of air is insured through thehandle with the result that the handle and paits associated therewithare maintained safely and comfortably cool.

From the foregoing specific description of the mechanism, its mode ofoperation and advantage should be apparent. The plug being inserted intoany convenient socket, the coil ll will develop suilicient heat for theusual soldering purposes at the point 12. A considerable portion of thisheat will be imparted to the shank, but because of the insulatingflexible bushing into which the rear end of the shank is fitted, but asmall portion of this heat will be communicated to the handle. Moreover,the' circulation of air provided for by the radial holes in the handleWill dissipate practically all the heat that would otherwise betransferred to the handle. In both forms of the invention, moreover, itwill be appreciated that the end of the coil, being housed directly7Within the copper tip or point, will heat the saine sutieientlv with theminimum amount ot energy.

I claim:

l. The herein deseribed soldering iron comprising a shank, a point, ahand-le for the shank arranged to surround a portion thereof and to liein spa-.Ced relation thereto, and a heat insulating member littedbetween the shank and the handle to reduce the transfer of heat 'fromthe shank to the handle,

said insulating member having direct eon-v tact With. the handle andtheshank in said space to support said shank and having i;

grooves running from one end to the other and communicating with theexterior to permit of circulation of air between the shank and thehandle and to reduce the transference of heat therebetween.

2. The herein described soldering iron comprising a shank, a pointmember carried thereby, means extei'idino along` the shank to heat thepoint, a handle for the shank, and a heat insulating bushing,` fittedbetween the .shank and the handle to reduce the transfer of heat fromthe shank to the handle, said insulating bushing' beingl in the form ofa fluted metal sleeve havinjr grooves inside and outside and split alongthe side.

In testimony whereof l allix my signature.

JHN E. M ARSI`)EN.

